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(regurgitating my JuJitsu teacher) Simple wins fights, no matter what level you are you're going to need to rely on the white belt moves, because that's your base and that's where you need to be able to make the right move on instinct.

As a white belt where I train we don't learn submissions, they're not the basics. The basics are break-falls, movement, striking, positioning, and keeping your hands up.
Can a submission win a fight, yes, is it always going to be ideal, no. The more training and experience you have the better off you should be on average.